AVCaptureSession条形码扫描 [英] AVCaptureSession barcode scan
本文介绍了AVCaptureSession条形码扫描的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我目前正在使用 AVCaptureSession
和 AVCaptureMetadataOutput
。
它完美无缺,但我只是想知道如何指示仅在 AVCaptureVideoPreviewLayer的特定区域扫描和分析元数据对象
?
It works perfectly, but I just want to know how to indicate to scan and analyze metadata objects only on a specific region of the AVCaptureVideoPreviewLayer
?
推荐答案
以下是我所拥有的项目代码示例,可以帮助您走上正轨
Here is a sample of code from a project I have that may help you on the right track
// where 'self.session' is previously setup AVCaptureSession
// setup metadata capture
AVCaptureMetadataOutput *metadataOutput = [[AVCaptureMetadataOutput alloc] init];
[self.session addOutput:metadataOutput];
[metadataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[metadataOutput setMetadataObjectTypes:@[AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeEAN13Code]];
// setup preview layer
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
previewLayer.frame = self.previewView.bounds;
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
// we only want the visible area of the previewLayer to accept
// barcode input (ignore the rest)
// we need to convert rects coordinate system
CGRect visibleMetadataOutputRect = [previewLayer metadataOutputRectOfInterestForRect:previewLayer.bounds];
metadataOutput.rectOfInterest = visibleMetadataOutputRect;
// add the previewLayer as a sublayer of the displaying UIView
[self.previewView.layer addSublayer:previewLayer];
这篇关于AVCaptureSession条形码扫描的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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